function checking_key(gae_search)
{
if(gae_search.start_date.selectedIndex==0)
   {
   alert('Please select a Course Start Date');
   gae_search.start_date.focus();
   return false;
   }

if(gae_search.class_location.selectedIndex==0)
   {
   alert('Please select a Class Location');
   gae_search.class_location.focus();
   return false;
   }
}